Systematic study on propulsive performance of tandem hydrofoils for a wave glider

Fuming Yang, Weichao Shi, Dazheng Wang

Research output: Contribution to journalArticle

Abstract

This paper presents the propulsive performance optimization of tandem hydrofoils equipped in a wave glider in head sea conditions with the aid of computational fluid dynamic (CFD) method by using a commercial CFD code, STAR-CCM+. Firstly, this work performs a systematic study on a single 2D hydrofoil to study the effect of varying the pivot position and the torsional spring stiffness to seek for the optimum propulsive performance within a range of velocity. Secondly, parametric studies on the propulsive performance of 2D and 3D six tandem hydrofoils are conducted by varying the oscillation amplitude and the torsional spring stiffness. The result reports: The results show that the torsional springs play a critical role in propulsive performance, comparing to the pivot position. The propulsive performance of the middle hydrofoil is greater than the others in the fore and after positions. When 2D and 3D six tandem hydrofoils achieve the optimum propulsive performance, the frequency ratio is chosen to be around 25 (torsional spring stiffness (k S =0.8N⋅m/rad)) and 17 (torsional spring stiffness (k S =11.8N⋅m/rad)), respectively. Comparing to previous study, the propulsive performance of each hydrofoil in six tandem hydrofoil configuration is greatly improved and none of hydrofoil produce negative thrust.

Original languageEnglish
Pages (from-to)361-370
Number of pages10
JournalOcean Engineering
Volume179
Early online date7 Mar 2019
DOIs
Publication statusPublished - 1 May 2019

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Gliders
Hydrofoils
Stiffness
Computational fluid dynamics

Keywords

  • wave glider
  • tandem hydrofoils
  • passive eccentric rotation
  • torsional spring

Cite this

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title = "Systematic study on propulsive performance of tandem hydrofoils for a wave glider",
abstract = "This paper presents the propulsive performance optimization of tandem hydrofoils equipped in a wave glider in head sea conditions with the aid of computational fluid dynamic (CFD) method by using a commercial CFD code, STAR-CCM+. Firstly, this work performs a systematic study on a single 2D hydrofoil to study the effect of varying the pivot position and the torsional spring stiffness to seek for the optimum propulsive performance within a range of velocity. Secondly, parametric studies on the propulsive performance of 2D and 3D six tandem hydrofoils are conducted by varying the oscillation amplitude and the torsional spring stiffness. The result reports: The results show that the torsional springs play a critical role in propulsive performance, comparing to the pivot position. The propulsive performance of the middle hydrofoil is greater than the others in the fore and after positions. When 2D and 3D six tandem hydrofoils achieve the optimum propulsive performance, the frequency ratio is chosen to be around 25 (torsional spring stiffness (k S =0.8N⋅m/rad)) and 17 (torsional spring stiffness (k S =11.8N⋅m/rad)), respectively. Comparing to previous study, the propulsive performance of each hydrofoil in six tandem hydrofoil configuration is greatly improved and none of hydrofoil produce negative thrust.",
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Systematic study on propulsive performance of tandem hydrofoils for a wave glider. / Yang, Fuming; Shi, Weichao; Wang, Dazheng .

In: Ocean Engineering, Vol. 179, 01.05.2019, p. 361-370.

Research output: Contribution to journalArticle

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